文件被system进程锁定，不能删除，没有明显用户进程操作此文件。

软件UNLOCKER,WHOLOCKME,LOCK HUNTER之类的，可能需要重启才能解决问题，这在生产环境 中是不可接受的。

能作的还是慢慢搜索可用解决方案。。

然后，找到此个文档，显示了被SYSTEM占用文件的解决办法，并将此归为WIN2008的一个小BUG，但不知道实际效果如何。。：

http://stackoverflow.com/questions/4378192/windows-2008-r2-kernel-system-process-pid-4-is-locking-files-and-folders

Windows 2008 R2 - Kernel (System Process PID=4) is locking files and folders

As Dani has already mentioned in the comment:

It's a bug in Windows 7 and likely in Windows Server 2008 (possibly 64bit versions only). It surfaces when you disable Application Experience service.

Re-enabling this service has fixed this problem for me.

A bit more info here as to why it's causing a problem.

List of other SO questions which seem to be related:

• Visual      Studio output file permissions?